A practical reference on Anti-doping testing: what it is, how it behaves, what the literature reports, and where the honest uncertainties sit.
Reviewed 2026-05-21. Anything still debated is marked as such rather than presented as settled.
The compound is typically described as a laboratory compound rather than a therapeutic product. Published reports have explored its role in lipid disorders, insulin sensitivity, and exercise metabolism, yet no major drug regulator has approved it for medical use. Commercial samples sold under the cardarine name may vary in purity and identity. Analytical confirmation is therefore necessary when the material is discussed in scientific or regulatory contexts. Its classification as a prohibited substance in sport further shapes how it is studied and reported.
Cardarine is a common name for GW501516, a synthetic compound studied for its effects on lipid and glucose metabolism. It functions as an agonist at peroxisome proliferator-activated receptor delta, or PPARδ, a nuclear receptor that influences gene expression. The molecule is not a steroid, nor is it a selective androgen receptor modulator. It is also known in research and sports literature as GW-501516 and endurobol. Early laboratory work examined its metabolic activity in cell cultures and animal models.
Clinical development stopped after rodent studies showed tumors at multiple sites. Whether those findings predict human cancer risk remains an open question, but they led sponsors to discontinue programs. Human safety data are limited to small, short-term studies that were not designed to assess cancer risk. Reported effects in those studies included changes in blood lipids, but the evidence is insufficient for medical use. Long-term consequences of nonmedical use are not well characterized. Questions about dose, duration, and individual susceptibility remain unresolved.
Cardarine is a common name for GW501516, an investigational compound developed in the 1990s for metabolic conditions. It acts as an agonist at peroxisome proliferator-activated receptor delta, a nuclear receptor involved in lipid and energy metabolism. The compound is frequently mislabeled as a selective androgen receptor modulator, or SARM, but its molecular target is different. GW501516 reached early clinical testing before development was discontinued. It has no approved therapeutic use in any country. The name cardarine is not a formal international nonproprietary name.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic PPARδ agonist | Not a steroid or a selective androgen receptor modulator. |
| Common synonyms | Cardarine, GW501516, GW-501516, endurobol | Names vary by supplier and literature source. |
| Appearance | White to off-white powder | Consistent with many small-molecule research chemicals. |
| Solubility | Low in water; soluble in DMSO and ethanol | Often prepared in organic solvent for laboratory work. |
| Primary target | PPARδ (NR1C2) | Nuclear receptor involved in lipid and energy metabolism. |
Literature on cardarine often separates receptor pharmacology from toxicology. Mechanistic papers describe PPARδ activation and gene expression changes, while safety assessments focus on carcinogenicity and species differences. Questions remain about whether rodent tumors arise through PPARδ-dependent or off-target mechanisms. Another open area is how human metabolism and exposure compare with those in animal studies. Analytical methods such as liquid chromatography–mass spectrometry are used to confirm identity in biological and product samples.
GW501516 acts as an agonist at the peroxisome proliferator-activated receptor delta, a nuclear receptor that regulates gene expression. Activation shifts transcription toward genes involved in fatty acid uptake, oxidation, and energy expenditure. The compound does not bind the androgen receptor and therefore differs from anabolic steroids and SARMs. In rodent models, this metabolic shift has been linked to increased running endurance and reduced fat accumulation. The exact downstream pathways in humans remain incompletely characterized.
Early clinical research explored GW501516 for lipid disorders, obesity, and diabetes. Some short-term human studies reported changes in HDL cholesterol, LDL cholesterol, and triglycerides. The development program was discontinued after rodent studies showed dose-dependent tumor formation in multiple tissues, including liver, bladder, stomach, and skin. These findings raised concerns about long-term cancer risk in humans. Because human exposure data are limited, the clinical significance of the rodent tumors remains uncertain.
Stability of GW501516 depends on form, temperature, light exposure, and moisture. Solid reference material is typically stored frozen or refrigerated in a desiccator and protected from light. Solutions in organic solvents such as dimethyl sulfoxide are often kept frozen in aliquots to reduce freeze-thaw cycling. Aqueous solubility is low, so aqueous stock solutions can be difficult to prepare without cosolvents. Degradation may appear as changes in chromatographic purity or mass spectral signal. Stability studies are needed to establish shelf life for any specific preparation.
Quality assessment for cardarine samples usually combines identity, purity, and impurity testing. Nuclear magnetic resonance spectroscopy and mass spectrometry can confirm molecular structure, while high-performance liquid chromatography estimates purity. Certificates of analysis from testing laboratories may list these results, but they do not establish safety or legality. In the absence of approved manufacturing, products sold online may contain the wrong compound, variable amounts, or unlisted contaminants. Independent verification is therefore central to analytical work and to interpreting any reported biological activity.
Laboratory detection of GW501516 commonly uses liquid chromatography coupled with tandem mass spectrometry. The method can identify the parent compound or its metabolites in urine and blood after sample cleanup. Protein precipitation, solid-phase extraction, or enzymatic hydrolysis may precede analysis, depending on the matrix. Reference standards are required for accurate quantification and confirmation. Because the compound is not approved, testing often occurs in anti-doping, forensic, or research settings rather than routine clinical care. Results are reported with limits of detection and quantification.
Cardarine is explicitly prohibited by the World Anti-Doping Agency under the class of PPARδ agonists. Its presence in urine or blood samples can be detected using mass spectrometry-based methods, often liquid chromatography-tandem mass spectrometry. Athletes who test positive may face sanctions, including bans from competition. The compound is also regulated as a prescription-only or unapproved drug in many countries. Enforcement varies by jurisdiction, and some regions treat it as a controlled substance. Online sales may occur despite these restrictions, creating quality and legal risks.
Laboratory detection of cardarine typically involves sample preparation followed by chromatographic separation and mass spectrometric identification. Urine is the most common matrix for anti-doping tests, though blood and hair have also been explored. Methods can target the parent compound or its metabolites, depending on the expected window of detection. Reference standards are required for accurate quantification. Matrix effects and dilution can influence results, so laboratories use internal standards and validation protocols. The exact detection window varies with dose, route, and individual metabolism.
Cardarine is not approved for human therapeutic use in any major jurisdiction. It appears on the World Anti-Doping Agency Prohibited List as a PPARδ agonist within the hormone and metabolic modulators category. Sports organizations test for it because it has been detected in athlete samples and seized products. Regulatory actions against marketed research chemical versions have occurred in several countries, though enforcement varies. Availability through unregulated channels complicates oversight.
Analytical laboratories typically identify cardarine and its metabolites using liquid chromatography-tandem mass spectrometry. Urine is a common matrix in anti-doping testing, while blood and tissue may be used in research settings. Detection windows depend on the assay, the sample matrix, and the compound's metabolism. Because cardarine is extensively metabolized, laboratories often target specific metabolites to improve sensitivity and confirmation. Reference standards are required for reliable quantification. Method validation includes checks for selectivity, linearity, and carryover.
A persistent misconception is that cardarine is a fat-burning drug or a safe alternative to anabolic steroids. No approved therapeutic product exists, and human safety data are limited. The tumor findings in rodents remain a central concern in scientific reviews. Products sold online may contain inaccurate labels, impurities, or different compounds entirely, which complicates any assessment of effects. Independent testing of such products has reported frequent mislabeling. For these reasons, discussions in the literature emphasize risks and unknowns rather than benefits.
==== Elemental fractionation between monazite and silicates ==== Elemental fractionation refers to the difference between the amount of an element incorporated into the solid mineral phase and the amount left in the fluid phase. Minerals display preferential intake of certain elements during growth. For example, as monazite grows in size, it preferentially incorporates Th in its crystal structure, resulting in less available Th in the fluid for future monazite growth. Thus, younger monazite tends to have lower Th content. This is one of the principal reasons for the compositional variation of monazite. When considering the whole system of metamorphic rocks, there are other minerals which show elemental fractionation. The interplay between fractionation in monazite and these other minerals has a great impact on the compositional zonation of monazite. The interplay is often caused by the formation and breakdown of the minerals, which is a result of different stages in P-T paths. Dating fractionation-related zonation thus helps put time constraints on metamorphism.
Surimi: Surimi and surimi-based products are an example of value added products. Surimi is prepared from the mechanically deboned, washed (bleached) and stabilised flesh of fish. "It is an intermediate product used in the preparation of a variety of ready to eat seafood such as kamaboko, fish sausage, crab legs and imitation shrimp products. Surimi-based products are gaining more prominence worldwide, because of the emergence of Japanese restaurants and culinary traditions in North America, Europe and elsewhere. Ideally, surimi should be made from low-value, white fish with excellent gelling ability and which are abundant and available year-round. At present, Alaskan pollack accounts for a large proportion of the surimi supply. Other species, such as sardine, mackerel, barracuda, striped mullet have been successfully used for surimi production." Fishmeal and fish oil: "A significant proportion of the world catch (20 percent) is processed into fishmeal and fish oil. Fishmeal is a ground solid product that is obtained by removing most of the water and some or all of the oil from fish or fish waste. This industry was launched in the 19th century, based mainly on surplus catches of herring from seasonal coastal fisheries to produce oil for industrial uses in leather tanning and in the production of soap, glycerol and other non-food products. Presently, it uses small oily fish to produce fishmeal and oil. It is worthy to mention that, only where it is uneconomic or impracticable for human consumption, should the catch be reduced to fishmeal and oil.
=== Netherlands === The Netherlands Armed Forces version of the 24-hour ration (Dutch: Gevechtsrantsoen, lit. 'combat ration') includes canned or retort pouched items, plus hard biscuits, jam, cheese spread, 3 cans of meat spread and 1 can of tuna spread, a chocolate bar, a roll of mints, instant coffee, tea, hot chocolate, lemon-flavour energy drink powder, instant soup, a vitamin pill, and supplementary items. The canned main course is packed in a thin aluminium can rather like a large sardine tin, containing 400 g of a precooked item such as rice with vegetables and beef, chicken with rice and curry, potatoes with sausage and green vegetables, or sauerkraut with sausage and green vegetables. The newer retort-pouches contain a 350 g serving of dishes such as brown beans with pork, chili con carne, corned beef hash, or chicken and pasta in tomato sauce. The ration pack provides breakfast and lunch only; the two canned or pouched main meals are issued separately.
When bacteria grow in anaerobic environments, the terminal electron acceptor is reduced by an enzyme called a reductase. E. coli can use fumarate reductase, nitrate reductase, nitrite reductase, DMSO reductase, or trimethylamine-N-oxide reductase, depending on the availability of these acceptors in the environment. Most terminal oxidases and reductases are inducible. They are synthesized by the organism as needed, in response to specific environmental conditions.
Kripke explained that Soldier Boy was Vought's version of Wayne since he worked for them for several decades and is someone who comes from a different era, but still has the ego and ambition for which he described him as the "Homelander before Homelander." Many of the changes were applied to give Homelander a threat just as he is finally starting to take control of Vought, but Kripke wanted to ensure that it was someone that the character has never faced before with someone that has the same strength as him and could actually fight him, for which he considered Soldier Boy to be the best match. Besides introducing Soldier Boy, the season also introduces the superhero team Payback for which the character was leader. Unlike in the comics where the team served as a rival of the Seven, Payback has already disbanded by the time where the series take place; it used to be the world's premiere team of supes before the Seven was formed and is described as "the Seven before the Seven." Kripke explained that the changes were mostly done to get a deeper exploration of Vought's history by exploring the past of each member of the teams, so the writers are allowed to shed light on the show's present. The season also includes a storyline focused mostly on Kimiko Miyashiro. As the season progresses, Kimiko goes through an emotional arc for which she starts learning to express herself after spending most of her life doing what other people wanted.
Sources: en.wikipedia.org
=== Types of toxicity === Acute toxicity occurs over hours or a few days. Chronic toxicity results from adult daily intakes greater than 25,000 IU for 6 years or longer and more than 100,000 IU for 6 months or longer.
antiparallel The contrasting orientations of the two strands of a double-stranded nucleic acid (and more generally any pair of biopolymers) which are parallel to each other but with opposite directionality. For example, the two complementary strands of a DNA molecule run side-by-side but in opposite directions with respect to chemical numbering conventions, with one strand oriented 5'-to-3' and the other 3'-to-5'.
==== Elsewhere ==== In Australia, the labourist and socialist movements were gaining traction and the Australian Labor Party (ALP) was formed in Barcaldine, Queensland in 1891 by striking pastoral workers. In 1889, a minority government led by the party was formed in Queensland, with Anderson Dawson as the Premier of Queensland, where it was founded and was in power for one week, becoming the world's first government led by democratic socialists. The ALP has been the main driving force for workers' rights and the welfare state in Australia, backed by Australian trade unions, in particular the Australian Workers' Union. Brazil’s First Socialist Congress occurred in Rio de Janeiro in 1902. Later that year, in São Paulo, another Socialist Congress took place and the Workers' Socialist Party (Partido Operário Socialista) was founded, considered to be the first socialist party in Brazil. In 1895, the Socialist Workers Party (Partido Socialista Operário) was founded. That same year, Silvério Fontes, considered the first Brazilian Marxist, launched the Socialist Center of Santos, which soon published the socialist magazine A Questão Social (The Social Question) and newspaper O Socialista (The Socialist).
=== Wound state === Wound bed, wound edge and periwound skin should be examined before the initial treatment plan is devised. It should also be re-assessed at each visit or each dressing change. For wound bed, the following parameters are assessed:
== Types of natural molecules present in wine == Acids in wine Phenolic compounds in wine Proteins in wine Sugars in wine Yeast assimilable nitrogen Minerals Dissolved gas (CO2) Monoterpenes and sesquiterpenes such as linalool and α-terpineol Glutathione (reduced and oxidized)
Sources: en.wikipedia.org
Cardarine is a common name for GW501516, a synthetic PPARδ agonist. It is not a steroid or a selective androgen receptor modulator. It was developed and studied as a research compound for metabolic pathways.
It binds to and activates PPARδ, a nuclear receptor that regulates genes related to fatty acid oxidation and energy use. This activation alters transcription in tissues such as skeletal muscle and liver. The full range of downstream effects in humans is not fully established.
No, cardarine is not known to occur naturally in plants, animals, or humans. It is a synthetic molecule produced for laboratory research. Products labeled as cardarine should therefore be treated as manufactured chemicals with variable purity.
No. Cardarine is GW501516, a PPARδ agonist, while SARMs act on androgen receptors. The two classes are often grouped in informal discussions despite different mechanisms.